[Stoves] CO2 Max for biomass

Tue May 27 13:25:29 CDT 2008

Dear AJH

Those are both figures too far from things quoted by others.

NO at low flame temps might be 20 to 30 ppm so you can ignore it.

Carbon doesn't really exist in a pure form in any fuel.  For coal the CO2
max is about 19.4%, maybe 19.2.

18.4% is cited from place to place but 'standards' vary. They are often
found near lists of Siegert numbers.

It would be good to have a sample of the calculation and people could input
their own fuel's analysis and get an accurate number.

Ideas?

Thanks
Crispin

-----Original Message-----
From: stoves-bounces at listserv.repp.org
[mailto:stoves-bounces at listserv.repp.org] On Behalf Of AJH
Sent: May 27, 2008 12:58 PM
To: Discussion of biomass cooking stoves
Subject: Re: [Stoves] CO2 Max for biomass

On Tue, 27 May 2008 12:09:29 -0400, Crispin Pemberton-Pigott wrote:

>I am just checking to see if there is general agreement on the figure of
>18.4% as the maximum obtainable CO2 level in the emissions from the perfect
>burning of (typical) biomass.

Is your typical biomass of the general form C10H14O6? Can we exclude
the nitrogen and sulphur compounds in the wood for now?
>
>If all the O2 has been used, some is H2O, a tiny bit SO2 and the rest CO2.
>Agreed?

You've missed out the nitrogen.

I think the volumetric proportions would be a maximum of 21% CO2 if
you burned carbon perfectly to CO2 in air and 10% if you burned
C10H14O6 perfectly in air.

AJH

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